724651909 has 2 divisors, whose sum is σ = 724651910. Its totient is φ = 724651908.

The previous prime is 724651901. The next prime is 724651943. The reversal of 724651909 is 909156427.

It is a happy number.

724651909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 641203684 + 83448225 = 25322^2 + 9135^2 .

It is a cyclic number.

It is not a de Polignac number, because 724651909 - 2³ = 724651901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (724651901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362325954 + 362325955.

It is an arithmetic number, because the mean of its divisors is an integer number (362325955).

Almost surely, 2^724651909 is an apocalyptic number.

It is an amenable number.

724651909 is a deficient number, since it is larger than the sum of its proper divisors (1).

724651909 is an equidigital number, since it uses as much as digits as its factorization.

724651909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 724651909 is about 26919.3593720207. The cubic root of 724651909 is about 898.2070928271.

The spelling of 724651909 in words is "seven hundred twenty-four million, six hundred fifty-one thousand, nine hundred nine".